Marine Corps Personal Papers, Boardman Collection
Japanese Special Naval Landing Force troops mount a British-made, Vickers eight-inch naval cannon into its turret on Betio before the battle. This film was developed from a Japanese camera found in the ruins while the battle was still on.
Colonel Shoup came up with an idea of how to tackle Betio’s barrier reefs. He had observed the Marines’ new Landing Vehicle Tracked (LVT or “Alligator”), an amphibian tractor, in operation during Guadalcanal. The Alligators were unarmored logistic vehicles, not assault craft, but they were true amphibians, capable of being launched at sea and swimming ashore through moderate surf.
Shoup discussed the potential use of LVTs as assault craft with Major Henry C. Drewes, commanding the 2d Amphibian Tractor Battalion. Drewes liked the idea, but warned Shoup that many of his vehicles were in poor condition after the Guadalcanal campaign. At best, Drewes could provide a maximum of 75 vehicles, not nearly enough to carry the entire assault and following waves. Further, the thin hulls of the vehicles were vulnerable to every enemy weapon and would require some form of jury-rigged armor plating for minimal protection. Shoup encouraged Drewes to modify the vehicles with whatever armor plate he could scrounge.
General Julian Smith was aware that a number of LVT-2s were stockpiled in San Diego, and he submitted an urgent request for 100 of the newer models to the corps commander. Holland Smith endorsed the request favorably, but Admiral Turner disagreed. The two strong-willed officers were doctrinally equal during the planning phase, and the argument was intense. While Turner did not dispute the Marines’ need for a reef-crossing capability, he objected to the fact that the new vehicles would have to be carried to Tarawa in tank landing ships (LSTs). The slow speed of the LSTs (8.5 knots max) would require a separate convoy, additional escorts, and an increased risk of losing the element of strategic surprise. Holland Smith reduced the debate to bare essentials: “No LVTs, no operation.” Turner acquiesced, but it was not a complete victory for the Marines. Half of the 100 new LVT-2s would go to the Army forces landing at Makin against much lighter opposition. The 50 Marine vehicles would not arrive in time for either work-up training or the rehearsal landings. The first time the infantry would lay eyes on the LVT-2s would be in the pre-dawn hours of D-Day at Tarawa—if then.
Assault Preparations
As replacement troops began to pour into New Zealand, General Smith requested the assignment of Colonel Merritt A. “Red Mike” Edson as division chief of staff. The fiery Edson, already a legend in the Corps for his heroic exploits in Central America and Guadalcanal, worked tirelessly to forge the amalgam of veterans and newcomers into an effective amphibious team.
Intelligence reports from Betio were sobering. The island, devoid of natural defilade positions and narrow enough to limit maneuver room, favored the defenders. Betio was less than three miles long, no broader than 800 yards at its widest point and contained no natural elevation higher than 10 feet above sea level. “Every place on the island can be covered by direct rifle and machine gun fire,” observed Edson.